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이탈리안 라이그라스 답리작 재배의 경제성 및 도입요인 분석
최현호 ( Hyunho Choi ),윤진우 ( Jinwoo Yun ),채용우 ( Yongwoo Chae ),박재형 ( Jeahyoung Park ) 한국농업정책학회 2018 농업경영정책연구 Vol.45 No.4
The purpose of this study is making suggestions for wider dissemination of IRG cultivation technologies as well as providing implications, analyzed the economic effects on the Italian ryegrass (IRG) in Central area and the effects of technology adoption for non-IRG farmers. The results showed that the incomes of “broadcasting under standing crop” and “strip seeding” groups differ significantly with a standard deviation of ±97,476 Korean won; and the latter’s income was higher than the former’s, 20.9% and 7%, respectively. Yet, the average farm income without governmental support is only 23,239 Korean won per 10a. Funding for long-term support and technical training need to be continuously provided in order to put in practice IRG sowing and farming technologies suitable for Central area, and thus to widely disseminate IRG. In addition, the spread of new knowledge and continuous implementation of educational and promotional activities are essential to enhance technological innovation and utility that influence adoption of technology by farmers. Also, for wider adoption of the new technology, it is necessary to establish a plan to improve its reliability by proving effects and removing the risks of the new technology.
최현호 ( Choi Hyunho ),윤정현 ( Yun Junghyun ),김문옥 ( Kim Moon Ok ) 한국구조물진단유지관리공학회 2020 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.24 No.1
In this study, correlation analysis between Atmosphere temperature and effective temperature for Bridge Design Standards is performed using regression curve. Based on this analysis considering recent domestic climate change, appropriate effective temperature range is suggested for design standards to determining the design of bridge expansion joint. From this, it is concluded that more widen effective temperature range is needed for design standards.
최현호 ( Choi Hyunho ),김인배 ( Kim In-bae ),김문옥 ( Kim Moon Ok ) 한국구조물진단유지관리공학회 2020 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.24 No.1
In this study, expansion joint gap data (12,825) of 4,821 bridges are empirically analyzed for identifying influencing factors. From this, it is investigated that joint gap has a much differences depends on bridge types such as steel and con’c and temperature as well known as main influencing factors. However, some factors can be ignored. It is concluded that more detail analysis considering influencing factors is needed to modify design and maintenance standards for expansion joint.
형상기억합금 수치해석을 위한 특성 실험 및 작동기 응용
최현호(Hyunho Choi),김상헌(Sanghaun Kim),조맹효(Maenghyo Cho) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Adaptation of two-way shape memory effect of SMA wire to the actuator is examined. Therefore the SMA characteristics which are training, material properties, response time at different thermal cycling rates are tested. During training, permanent deformation is accumulated till a certain number of cycle and then saturated. The amount of two-way strain is unchangeable over all cycle and the slope of strain(or stress)-temperature curve is slower as the increase of applied stress. The rate effect is observed resulted from the thermal distribution which heating profile differs from cooling as thermal cycling time. In addition, using the estimated SMA properties, an experimental test for the simple smart wing is performed.
전신 진동운동기 사용시 인체에 대한 생체역학적 특성 분석을 위한 가상 골격계 모델의 개발 및 검증
최현호(Hyunho Choi),임도형(Dohyung Lim),황선홍(Seonhong Hwang),김영호(Youngho Kim),김한성(Hansung Kim) Korean Society for Precision Engineering 2008 한국정밀공학회지 Vol.25 No.5
This study investigated biomechanical response through the 3-dimensional virtual skeletal model developed and validated. Ten male subjects in standing posture were exposed to whole body vibrations and measured acceleration on anatomical of interest (head, 7th cervical, 10th thoracic, 4th lumbar, knee joint and bottom of the vibrator). Three dimensional virtual skeletal model and vibration machine were created by using BRG LifeMOD and MSC. ADAMS. The results of forward dynamic analysis were compared with results of experiment. The results showed that the accuracy of developed model was 73.2±19.2% for all conditions.